How she grips the revolver has a lot to do with the perceived weight of the trigger pull.
The higher on the grip she holds it, the easier it will be to pull the trigger.
The web of her hand should completely cover and be slightly higher than the upper most part of the grip panels.
And crossing her thumbs behind the hammer and pushing forward helps, too.
Just don't use that technique with an auto loading pistol.
Probably the most important part is locking the wrists, and maintaining the grip through out the trigger pull and follow through, eliminating wobble and lost motion.
Try to find Jerry Miculek's online videos on the revolver grip.
Lock the doors, they're coming in the windows.